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Cheshire110

Member Since: 26 Jul 2013
Location: Cheshire/London
Posts: 2724

Weird one... Engine revs speaker whistle

Today my 110 developed an engine-revs related hiss/whistle through my rear speakers.

The engine revs directly control the note of the whistle!

Interference with wiring from the engine?

The rear speakers were added by me a few months ago and are 6x9s wired directly from the standard rear wiring.

Suggestions? Cheers, David
Land Rovers of all shapes S3 onwards… Daily is a 110 V8.

24th May 2014 10:14pm

munch90

Member Since: 26 Oct 2013
Location: guildford
Posts: 3558

normally comes from alternator

24th May 2014 10:21pm

custom90

Member Since: 21 Jan 2010
Location: South West, England.
Posts: 19579

You've got hi level input from the rear speakers. Try low which is using RCA connections that are shielded.
That's something to try, other than that above is correct.
If that doesn't cure it you have noise interference in the system which you will need a suppressor.
Also are your Amp and HU settings all correct?

24th May 2014 10:35pm

Cheshire110

Member Since: 26 Jul 2013
Location: Cheshire/London
Posts: 2724

Sorry Steve you lost me there with the hi and low level inputs? Cheers, David
Land Rovers of all shapes S3 onwards… Daily is a 110 V8.

24th May 2014 10:44pm

custom90

Member Since: 21 Jan 2010
Location: South West, England.
Posts: 19579

I'm assuming you have an Amp? If so if you took your audio signal from the rear speakers to the Amp for 6x9's that's a hi level input.
If you use RCA connections from HU to the Amp instead that is low level.
Low level signals generally is the best option.
Make sense?

24th May 2014 10:50pm

Cheshire110

Member Since: 26 Jul 2013
Location: Cheshire/London
Posts: 2724

No they run direct from the standard rear speaker wiring actually, no amp...

Should I just check for loose connections etc?

Only appeared today... Cheers, David
Land Rovers of all shapes S3 onwards… Daily is a 110 V8.

24th May 2014 10:57pm

munch90

Member Since: 26 Oct 2013
Location: guildford
Posts: 3558

can be down to bad earth or earth position , have you got any earths direct to battery

24th May 2014 10:58pm

borderterrier

Member Since: 09 Dec 2011
Location: Surrey
Posts: 1677

2013 Defender 110 Puma 2.2 XS CSW Aintree Green

This is normally an issue on older vehicles. Your 2010 truck should have shielded cables and therefore no alternator whine. Can also be a bad earth.

24th May 2014 10:59pm

munch90

Member Since: 26 Oct 2013
Location: guildford
Posts: 3558

davidwhittaker wrote:
No they run direct from the standard rear speaker wiring actually, no amp...

Should I just check for loose connections etc?

Only appeared today...

I would start with connection to rear speaker
where are rear speakers ?
is it only rears ?

24th May 2014 11:00pm

custom90

Member Since: 21 Jan 2010
Location: South West, England.
Posts: 19579

LED lighting can also have an effect in some cases, rare but worth thinking about if anything is in the close vicinity.
What power consumption are the 6x9's?
Ideally if just running of the rear speaker wires and HU they shouldn't be no more than 50wRMS which most are more than that.
As mentioned above alternator issues are usually with older vehicles.
Is the Alternator producing a steady voltage? That might be worth checking especially with engine running under revs.

24th May 2014 11:09pm

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